Matteo Casadei Ronaldo Menezes Mirko Viroli Robert Tolksdorf Self-organized over-clustering avoidance in tuple-space systems. 1408-1415 2007 IEEE Congress on Evolutionary Computation http://dx.doi.org/10.1109/CEC.2007.4424636 conf/cec/2007 db/conf/cec/cec2007.html#CasadeiMVT07